Thomas Brand addressed one of the most common myth on disk permissions:

The only time you need to run Repair Disk Permissions is if you changed a system-level permission you shouldn’t have.

I used to stay up late searching for tools and tips to optimize Mac. I downloaded all the some recommended applications that claim to optimize and speed up OS X. I guess what they do are simply clearing caches and changing priority of the processes. It wasn’t a pleasant experience. I ended up staying awake whole night trying to revert its condition from fast to normal.

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